参数资料
| 型号： | SC1462ISKTRT |
| 厂商： | Semtech |
| 文件页数： | 6/10页 |
| 文件大小： | 0K |
| 描述： | IC REG SWITCHD CAP DBL ADJ SOT23 |
| 标准包装： | 1 |
| 类型： | 切换式电容器（充电泵），倍增器 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 12V |
| 输入电压： | 1.65 V ~ 5.5 V |
| 频率 - 开关： | 160kHz |
| 电流 - 输出： | 80mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 包装： | 标准包装 |
| 供应商设备封装： | SOT-23-6 |
| 产品目录页面： | 1357 (CN2011-ZH PDF) |
| 其它名称： | SC1462ISKDKR |
NOT RECOMMENDED FOR NEW DESIGN
POWER MANAGEMENT
Applications Information (Cont.)
SC1462
Capacitor Selection
Capacitor selection is based on both the maximum ac-
ceptable ripple voltage and the maximum tolerable drop
at the output.
Ripple
The peak-to-peak output ripple voltage is dependent on
the following factors:
1) Oscillator frequency
2) ESR of C OUT
3) Capacitance value of C OUT
Item 1 is ? xed and depend on the charge pump device
used. Item 2, and 3 can be optimized for best perfor-
This equation can be used to calculate C BUCKET for a spe-
ci ? c V OUT when V IN and I OUT are known. The maximum value
for the R SW from the Electrical Characteristics section on
Page 2 should be used in order to ? nd a worst-case num-
ber.
Layout Consideration
Standard power board layout should be followed to ensure
proper operation. Any stray inductance should be mini-
mized, this can be achieved by using large power planes
or traces, and reducing the distances between input, out-
put and the load. All components should be placed as
close as possible to the SC1462.
The following table shows typical capacitor characteris-
tics.
mance and reduction of the output ripple.
The following formula could be used for an approximation
for V OUT_RIPPLE .
Component
0.1 μ F Ceramic 0603 Package
1.0 μ F Ceramic 1206 Package
10 μ F Ceramic 0603 Package
ESR( Ω )
0.050
0.040
0.075
ESL(nH)
1.60
0.47
0.50
V OUT_RIPPLE =
I OUT
2 × f OSC × C OUT
+ 2 × I × ESR_ C OUT
47 μ F Ceramic, 16V Tantalum D case
330 μ F, 6.3V “OSCON”
330 μ F, 16V AL. Electrolytic
0.100
0.025
0.143
0.60
2.50
2.37
820 μ F, 4V “OSCON”
0.012
2.50
V OUT Drop
1000 μ F, 10V Al. Electrolytic
0.053
5.00
The voltage drop at the output is speci ? ed with the follow-
ing equation:
V OUT_DROP = I OUT × R OUT
R OUT is dependent on the following factors:
1)
2)
3)
4)
Oscillator frequency
ESR of C OUT & C BUCKET
Capacitance value of C OUT and C BUCKET
Internal switch resistance (R SW = Total of all 4 switch
resistances).
A good approximation for calculating the output
resistance is shown below.
R OUT =
1
f OSC × C BUCKET
+ 2 × R SW + 4 × ESR_ C BUCKET + ESR_ C OUT
? 2005 Semtech Corp.
6
www.semtech.com
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